R. R. is a 71-year-old female who presents with left lower quadrant pain that started out as cramping but has

become more constant over the last day. She reports constipation over the last few days but admits that for as long as she can remember she has had variable bowel habits. Her vital signs are normal, but physical examination reveals some tenderness in the left lower quadrant. Which diagnostic test is most likely to support the leading differential diagnosis?

A. CT scan with IV, oral, and rectal contrast

B. CBC with WBC differential

C. Colonoscopy

D. Barium enema

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